package string;

public class StringStringBuilderDemo {
    public static void main(String[] args) {
        String s="a";
        StringBuilder builder=new StringBuilder(s);
        for(int i=0;i<10000000;i++){
            builder.append(i);
        }
        System.out.println("执行完毕");
    }
    /*
    String s="a";
    for(int i=0;i<10000000;i++){
        s=s+i;
    }
    System.out.println("执行完毕")
     */
}
